Wristwatch



FIG. 1 is a front perspective view of a wristwatch showing my new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear views thereof.

The portions of the wristwatch shown in broken lines form no part of the claimed design. 

The ornamental design for a wristwatch, as shown and described. 